The ZJ Series is not just a pump; it is a system. It is specifically engineered for the vacuum drying and oil injection processes of transformers ranging from 220KV to the highest 1100KV UHV classes.
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Knowing how to fill SF6 gas in circuit breaker correctly is a basic s**** for power equipment maintenance personnel, which directly affects the insulation performance, arc-extinguishing effect and service life of the circuit breaker.
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When a transformer undergoes a major service, the oil is typically removed and processed through a separate purification plant. While the oil is being cleaned, the vacuum pump unit is applied to the empty transformer tank. This "hot vacuum" process uses the residual heat in the transformer core to drive moisture out of the cellulose. If the vacuum system is high-quality, it can reach a state of "high vacuum" where the moisture level in the paper insulation can be reduced to below 0.5%.
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A double-stage vacuum pump unit typically consists of a primary backing pump (usually a rotary vane or screw pump) and a secondary Roots pump. The synergy between these two stages allows the system to maintain a high pumping speed even at very low pressures.
